refactor(lifecycle): lifecycle methods prefixed w/ ionView

BREAKING CHANGES:

- Lifecycle method prefixes have changed to `ionView`
- `onPageLoaded` renamed to `ionViewLoaded`
- `onPageWillEnter` renamed to `ionViewWillEnter`
- `onPageDidEnter` renamed to `ionViewDidEnter`
- `onPageWillLeave` renamed to `ionViewWillLeave`
- `onPageDidLeave` renamed to `ionViewDidLeave`
- `onPageWillUnload` renamed to `ionViewWillUnload`
- `onPageDidUnload` renamed to `ionViewDidUnload`

src/components/action-sheet/action-sheet.ts

@@ -271,7 +271,7 @@ class ActionSheetCmp {
     }
   }
 
-  onPageLoaded() {
+  ionViewLoaded() {
     // normalize the data
     let buttons: any[] = [];
 
@@ -305,7 +305,7 @@ class ActionSheetCmp {
     this.d.buttons = buttons;
   }
 
-  onPageDidEnter() {
+  ionViewDidEnter() {
     let activeElement: any = document.activeElement;
     if (document.activeElement) {
       activeElement.blur();